A software example
Python's sorted() and list.sort() functions are examples of the Strategy pattern. Both functions accept a named parameter key, which is basically the name of the function that implements a sorting Strategy [Eckel08, page 202].
The following example (the code is in the langs.py file) shows how two different strategies can be used to sort programming languages in the following ways:
- Alphabetically
- Based on their popularity (using the TIOBE index [j.mp/tiobe14])
A namedtuple programming language [j.mp/namedtuple] is used to keep the statistics of the programming languages. A named tuple is an easy-to-create, lightweight, immutable object type. It is compatible with a normal tuple but it can also be treated as an object (can be called ...
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